A spectroscopic study of mechanochemically activated kaolinite with the aid of chemometrics

Onuma Carmody, J. Kristóf, Ray L. Frost, E. Makó, J. Theo Kloprogge, Serge Kokot

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The study of kaolinite surfaces is of industrial importance. In this work we report the application of chemometrics to the study of modified kaolinite surfaces. DRIFT spectra of mechanochemically activated kaolinites (Kiralyhegy, Zettlitz, Szeg, and Birdwood) were analyzed using principal component analysis (PCA) and multicriteria decision making (MCDM) methods, PROMETHEE and GAIA. The clear discrimination of the Kiralyhegy spectral objects on the two PC scores plots (400-800 and 800-2030 cm-1) indicated the dominance of quartz. Importantly, no ordering of any spectral objects appeared to be related to grinding time in the PC plots of these spectral regions. Thus, neither the kaolinite nor the quartz, are systematically responsive to grinding time according to the spectral criteria investigated. The third spectral region (2600-3800 cm-1 OH vibrations), showed apparent systematic ordering of the Kiralyhegy and, to a lesser extent, Zettlitz spectral objects with grinding time. This was attributed to the effect of the natural quartz on the delamination of kaolinite and the accompanying phenomena (i.e., formation of kaolinite spheres and water). With the MCDM methods, it was shown that useful information on the basis of chemical composition, physical properties and grinding time can be obtained. For example, the effects of the minor chemical components (e.g., MgO, K2O, etc.) indicated that the Birdwood kaolinite is arguably the most pure one analyzed. In another MCDM experiment, some support was obtained for the apparent trend with grinding time noted in the PC plot of the OH spectral region.

Original languageEnglish
Pages (from-to)43-56
Number of pages14
JournalJournal of Colloid and Interface Science
Volume287
Issue number1
DOIs
Publication statusPublished - Jul 1 2005

Fingerprint

Kaolin
kaolinite
Kaolinite
grinding
Quartz
decision making
quartz
plots
Decision making
principal components analysis
Delamination
Principal component analysis
discrimination
chemical composition
Physical properties
physical properties
trends
vibration
Water
Chemical analysis

Keywords

  • Chemometrics
  • DRIFT
  • Kaolinite surfaces
  • PCA
  • PROMETHEE and GAIA

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

A spectroscopic study of mechanochemically activated kaolinite with the aid of chemometrics. / Carmody, Onuma; Kristóf, J.; Frost, Ray L.; Makó, E.; Kloprogge, J. Theo; Kokot, Serge.

In: Journal of Colloid and Interface Science, Vol. 287, No. 1, 01.07.2005, p. 43-56.

Research output: Contribution to journalArticle

Carmody, Onuma ; Kristóf, J. ; Frost, Ray L. ; Makó, E. ; Kloprogge, J. Theo ; Kokot, Serge. / A spectroscopic study of mechanochemically activated kaolinite with the aid of chemometrics. In: Journal of Colloid and Interface Science. 2005 ; Vol. 287, No. 1. pp. 43-56.
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